Behaviour of organised disturbances in fully developed turbulent channel flow

摘要

In our earlier work we have shown the relevance of stability theory in understanding the sustenance of turbulence in turbulent boundary layers. Here we adopt the same model to study the evolution of organized disturbances in turbulent channel flow. Since the dominant modes are wall modes we find that the stability characteristics in the two flows are nearly identical although the boundary conditions (at the edge of the boundary layer and at the center of the channel) are different. Comparisons with the experiments of Hussain and Reynolds are also presented.